public class TestFruit() {
    public void run() {
        Mango fruit = new Mango();
        System.out.println(fruit + " My color is "+ fruit.getColor())
        fruit = new Lemon();
        System.out.println(fruit + " My color is "+ fruit.getColor();
    }
}

abstract class AFruit {
    abstract String getColor;
}

class Mango extend AFruit {
    public string toString() {
        retun "I am a sweet mango!";
    }
    public String getColor() {
        return green;
    }
}

class Lemon extends AFruit {
    public String toString() {
        return "I am a sour lemon!;
    }
  
    public String getColor() {
       "yellow";
}